adding examples for piezo driver

Adding Arduino and CircuitPython example for the piezo driver guide

Piezo_Driver_Examples/Arduino_Piezo_Driver_Example/Arduino_Piezo_Driver_Example.ino

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#define PIEZO_PIN  5      // Pin connected to the piezo buzzer.
+
+int toneFreq[] = {262, 294, 330, 349, 392, 440, 494, 523};
+int toneCount = 8;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Piezo Tone Example");
+}
+
+void loop() {
+
+  for (int i=0; i < toneCount; i++) {
+    Serial.print("Playing frequency: ");
+    Serial.println(toneFreq[i]);
+    tone(PIEZO_PIN, toneFreq[i]);
+    delay(250);  // Pause for half a second.
+    noTone(PIEZO_PIN);
+    delay(50);
+  }
+  Serial.println();
+  delay(1000);
+
+}

Piezo_Driver_Examples/CircuitPython_Piezo_Driver_Example/code.py

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2018 Kattni Rembor for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import pwmio
+
+piezo = pwmio.PWMOut(board.D5, duty_cycle=0, frequency=440, variable_frequency=True)
+
+while True:
+    for f in (262, 294, 330, 349, 392, 440, 494, 523):
+        piezo.frequency = f
+        piezo.duty_cycle = 65535 // 2  # On 50%
+        time.sleep(0.25)  # On for 1/4 second
+        piezo.duty_cycle = 0  # Off
+        time.sleep(0.05)  # Pause between notes
+    time.sleep(0.5)